Theodolite and similar angle-measuring instrument



. l "I. V. BAPTISVTA. THEODOUTE AND SIMILAR ANGLE MEASURING INSTRUMENLAPPLICATION FILED FEB. 4, |922. 194292555, PatentedSept. 19, 1922.

3 SHEETS-SHEET www I); f 2 I? ,Z4 J;

l. V. BAPTISTA.

THEODOLITE AND SIMILA'I? -ANGLE MEASURING INSTRUMENT'. APPLICATION FILEDres. 4, I922.

1,429,555, y f Pmmedsepnlsfwzz..

3 SHEETS-.SHEET 2.,

f @I @wg-QQ.,

I. v'. BAPTISTA.

THEODOLITE AND SIMILAR ANGLE MEASURING INSTRUMENT. v

APPLICATIQN FILED FEB. 4. |922.

' 1,429,555. Patentedsepf. 19,1922.

3 SHEETS-SHEET 3.

A, I 104 j Patented Sept. 19, 1922.

. 'UNITED srArs rarr IGNACIO viniA'io BAi'iisTA, or aioA DE JANEiRo,BRAZIL.

THEODOLITE AND SIMILAR ANGLE-MEASURING INSTRUMENT.

Application filed February 4, 1922. Serial No. 534,076.

To all whom t may concern Be it known that I, IGNACIO ViRiAro BAr-,Measuring Instruments, ofv which the tollowing is a specification.

The. invention relates to theodolites, re-

peating circles and other geodetic and topo-y graphic angle measuringinstruments and has for its object to provide such instruments withmanually operated means for recording on a cardboard disk ythe anglesmeasured. V

To this end the theodolite is provided with the following means forrecording the horizontal angular measurements made: Means for supportingon that part of the instrument, which is kept 4stationary whenhorizontal angles are measured, a disk of cardboard 4or like materialina horizontal position such that Vvthe vertical axis on which thetelescope of the theodolite revolves passes through the center of saiddisk; means for preventing the rotation or any other displacement ofsaiddisk supported in said horizontal position; means, manually operated,mounted on the `iframe supporting the telescope and which, whenoperated, print on said cardboard disk a straight line lyingv in thevertical plane passing through the optical axis of the telescope. It isclearly seen that a theodolite provided with such means for supporting acardboard disk and printing on it a'straight line, which reproducesexactly the optical axis of the instrument, can record on said disk allthe angular measurementsv made with'the instrument. For example, torecord azimuths, a straight'line is printed on the disk when the opticalaxis of the telescope lies in the plane of the meridian and a secondstraight line is printed when the point of which the azimuth is.desiredis sighted. Obviously, the two lines printed form acute angles,vertically opposed to each other, which are equal each to the azimuthmeasured by the instrument.

To record vertical angles, the theodolite is provided with the followingmeans: Means for supporting vertically on the frame, on which rotate thetrunnions on which the telescope revolves vertically, a cardboard diskat right angles to the horizontal axis on which the telescope revolves,

said axis passing through the center ofsaid disk; means for preventingthe rotation or any other movement of said Idisk. supported .insaidvertical position; supporting means,

secured to one of the trunnions ot the telescope; means, manuallyoperated, carried by said supporting means, and which when operated,print on said cardboard disk, supported in thel aforesaid manner, astraight line lying inl a 'plane which passes through the optical axisof the instrument. The way the vertical angles measured with theinstrument are recorded on the cardboard disk will be lclear to thosehaving a knowledge of geodetic -or topographic field work.

The invention alsoA includes, besides'the above mentioned means for`recording horilzontal and vertical angles, means for printing on thecardboard disk, on which the angles are recorded, a serial number orletter adjacent each straight line printed, this being done, preferably,at the same time the p straight line is printed.

`The invention may be rious ways. ings: theodolite providedwith means,according toy the present`v invention, to record the measurement ofhorizontal angles;` Fig. `2 is a fragmentary vertical cross sectionthrough the optical laxis of the instrument; Fig. 3 is a fragmentaryvertical cross section at right angles to that of Fig. 2;Fig. 4t is ahorizontal cross `section of the instrument;

carried out in va- In the accompanying draw- 'Figs 5 and 6 areelevations of the printing plate, on a larger scale; Figp? is a verticalcross section on line 7-7 of Fig. 8; and Figs. 8 and 9 are vertical`cross sections on lines 8 8 yand 9 9, respectively, of Fig. 7 Fig. l0is a fragmentary horizontalr cross section on `line 10-10 of Fig. 7 Fig.11 shows one of the types for printing numbers;

Figs. 12 to 15 show a theodolite provided with means, according to theinvention, to

record the measurement of vertical angles.

The telescope O of the theodolite shown in Figs. `l `to 11 is mountedtorevolve `in a vertical plane'on two standards 1, 1 vertically mountedon` a cylindrical collar 2, thev lower part` of which surrounds acircular plate 3 secured concentrically, by means Figure 1 isa sideelevation of a' telescope in the vertical plate. Ring 105 carries therecording device for vertical angular measurements, which is not shown,but which is, in all respects, identical to the recording device forhorizontal angular measurements of the theodolite described withreference to Figs. l to 11. The printing plate of said recording devicefor vertical angular measurements is mounted on grooves diametricallyopposed to each other, provided on ring 105 and is adapted to print onthe cardboard disk a straight line lying in the plane passing throughthe Vcenter of the disk and the optical axis of the instrument. If, onthe cardboard disk C, are printed two straight lines corresponding,respectively, to the horizontal position of tele- Scope O and to itsposition when a sight.

is taken to any point, obviously, the lines will make with each otheracute angles vertically opposed, each one of which will be equal to theangle formed by said point with the horizon, as viewed from theinstrument.

Having thus fully described my invention, what l claim as new and desireto secure by Letters Patent is:

1. A theodolite or similar instrument, comprising means for supportingon and removably securing to that part of the instrument, which is keptstationary when angular measurements are being made, a

cardboard disk having its center coinciding in the vertical planecontaining the opticaly axis of the instrument.

2. A theodolite or' similar instrument, comprising means for supportingand re movably securing to that part of the instrument, which is keptstationary when an gular measurements are beingmade, a cardboard diskhaving its center coinciding with the axis of the instrument; andrecording means, manually operated, mounted on that part of theinstrument which revolves on the stationary part, embodying a memberadapted to print on the cardboard disk a straight line following adiameter lying in the vertical plane containing the optical axis of theinstrument and being also adapted to print on the cardboard disk aligure or a letter adjacent each of the straight lines printed by saidrecording means, said figure or letter being diiferent for each line.

In testimony whereof I afliX my signature.

IGNACIO VIRIATO BAPTISTA.

